Fuel Tank Cap For Troy Bilt TB230 TB280 TB320 TB330 TB340 TB370 TB554 Lawn Mower

What It Is

This is a replacement fuel tank cap designed for Troy-Bilt TB230, TB280, TB320, TB330, TB340, TB370, and TB554 walk-behind lawn mowers. It seals the fuel tank to prevent leaks and evaporation, and it includes a vent to allow proper fuel flow to the carburetor.

Fitment & Compatibility

• Exact models: Fits Troy-Bilt TB230, TB280, TB320, TB330, TB340, TB370, and TB554. Does not fit most other Troy-Bilt series (e.g., TB200, TB400, or riding mowers).
• Check your mower’s deck size: This cap fits models with 21-inch and 22-inch decks (common on these TB series). If your mower has a different deck size, the cap may still fit, but verify the tank opening.
• OEM vs aftermarket: This is an aftermarket part. The OEM part number is typically 951-12427 or 751-12427. Confirm your mower’s tank cap matches this number.
• Measure the cap diameter: The cap opening is roughly 1.5 inches across. If your current cap has a different diameter, this won’t fit.
• Vent type: This cap uses a simple push-to-vent design. If your original cap had a separate vent or a twist-to-vent mechanism, this may not match.

Key Things to Know

• Quality concerns: 3.6/5 stars from 8 reviews suggests inconsistent quality. Some users report poor sealing or a loose fit after a few uses. Inspect the gasket when it arrives.
• Installation: Dead simple – just unscrew the old cap and screw this one on. No tools needed.
• Common gotcha: The vent may stick closed, causing fuel starvation (mower runs then dies). If that happens, manually open the vent by pressing the small button on top.
• Not universal: Even within Troy-Bilt, the TB series has multiple tank cap variations. Double-check your mower’s model number on the engine shroud or under the seat.

Should You Buy It

Buy this if you need a quick, cheap replacement for a lost or broken cap on a compatible TB230–TB554 mower and you’re okay with a slightly lower-quality aftermarket part. Skip it if you want OEM reliability, have a different Troy-Bilt series, or need a cap that vents reliably in hot weather.